I have a 1999 OBS burb with 131K miles on it. I have a miss between 1500 - 2200 rpms. There is no code or SES light. I put it on a scanner and it does not show a miss. It is not in the trans, as I can get it to miss while in park and rev up to 2500. I have replaced the following: tune-up (plugs/wire/cap/rotor) coil (2 different brands) fuel filter fuel pump O2 sensor TPS sensor seafoam in gas tank to clean injectors and swapped from the old poppet valve spider to the ungraded injector spider Still can't find miss. Any help? Basically stock, has flowmaster cat-back, K&n filter, and a PCM4less computer. I have even put the stock computer back in. Same problem. Motor still pulls strong to 5K rpm. If I am under light throttle and lite load, that is when the miss occurs. If I give it more gas, it goes away.